Fair Value Measurements (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and cash equivalent	$ 76,847	$ 40,072
Securities
Loans, net
Bank owned life insurance
Accrued interest receivable
Liabilities
Demand deposits and interest-bearing transaction and money market accounts
Certificates of deposit
Securities sold under agreements to repurchase
Accrued interest payable
Significant Other Observable Inputs (Level 2) [Member]
Assets
Cash and cash equivalent
Securities	137,177	133,027
Loans, net
Bank owned life insurance	12,702	12,595
Accrued interest receivable	503	566
Liabilities
Demand deposits and interest-bearing transaction and money market accounts	334,965	306,298
Certificates of deposit	125,382	124,391
Securities sold under agreements to repurchase	13,448	16,297
Accrued interest payable	108	125
Significant Unobservable Inputs (Level 3) [Member]
Assets
Cash and cash equivalent
Securities
Loans, net	289,803	297,765
Bank owned life insurance
Accrued interest receivable	648	681
Liabilities
Demand deposits and interest-bearing transaction and money market accounts
Certificates of deposit
Securities sold under agreements to repurchase
Accrued interest payable
Carrying Value [Member]
Assets
Cash and cash equivalent	76,847	40,072
Securities	137,177	133,027
Loans, net	288,685	296,674
Bank owned life insurance	12,702	12,595
Accrued interest receivable	1,151	1,247
Liabilities
Demand deposits and interest-bearing transaction and money market accounts	334,965	306,298
Certificates of deposit	125,156	124,162
Securities sold under agreements to repurchase	13,448	16,297
Accrued interest payable	108	125
Fair Value [Member]
Assets
Cash and cash equivalent	76,847	40,072
Securities	137,177	133,027
Loans, net	289,803	297,765
Bank owned life insurance	12,702	12,595
Accrued interest receivable	1,151	1,247
Liabilities
Demand deposits and interest-bearing transaction and money market accounts	334,965	306,298
Certificates of deposit	125,382	124,391
Securities sold under agreements to repurchase	13,448	16,297
Accrued interest payable	$ 108	$ 125

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Surrender Value

-URI http://asc.fasb.org/extlink&oid=6507153

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

-URI http://asc.fasb.org/extlink&oid=6517073

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of time deposit liabilities held by the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of demand deposits, interest-bearing transaction and money market accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	vabk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value portion of accrued interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

+ References

No definition available.

+ Details

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Namespace Prefix:	vabk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value portion of interest earned but not received (which is also called accrued interest or accrued interest receivable).

+ References

No definition available.

+ Details

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Namespace Prefix:	vabk_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant